<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <link rel="stylesheet" href="../bootstrap/css/bootstrap.css">
</head>
<body>

<div class="btn-toolbar" role="toolbar" aria-label="Toolbar with button groups">
    <div class="btn-group mr-2" role="group" aria-label="First group">
        <button type="button" class="btn btn-primary">1</button>
        <button type="button" class="btn btn-primary">2</button>
        <button type="button" class="btn btn-primary">3</button>
        <button type="button" class="btn btn-primary">4</button>
    </div>
    <div class="btn-group mr-2" role="group" aria-label="Second group">
        <button type="button" class="btn btn-secondary">5</button>
        <button type="button" class="btn btn-secondary">6</button>
        <button type="button" class="btn btn-secondary">7</button>
    </div>
    <div class="btn-group" role="group" aria-label="Third group">
        <button type="button" class="btn btn-info">8</button>
    </div>
</div>

<script src="../bootstrap/js/bootstrap.js"></script>
</body>
</html>